636 results about "Rust" patented technology

The invention provides a wet-type high-power combined laser cleaning method suitable for a heavily-corroded steel structure. S1, measuring the thickness of a rust layer on the steel surface of the steel structure; s2, liquid is sprayed to the surface of the to-be-cleaned area of the steel structure to form a liquid film, and the liquid film is used for increasing the laser absorptivity of the surface of the rust layer; s3, the to-be-cleaned area is preliminarily cleaned through continuous laser, the rust layer is made to be fluffy and stripped through the thermal expansion effect, and the thickness of the rust layer is reduced to be not larger than the target threshold value of preliminary cleaning; s4, performing fine cleaning by using pulse laser to accurately remove a residual stubborn rust layer; s5, the to-be-cleaned area is washed; the device can effectively remove a rust layer on the surface of the steel, reduce plasma and smoke dust generated in the laser cleaning process, ensure the safety and high efficiency of the cleaning process, adopt the combination of continuous laser and pulse laser, clean in stages, effectively improve the cleaning efficiency, and reduce thermal damage to the surface of the steel.

The present invention addresses the problem of providing a plated steel sheet having good LME resistance and red rust resistance.　A plated steel sheet according to the present invention is provided with a plating layer on one surface or both surfaces of a steel sheet and has a tensile strength of 780 MPa or more. The steel sheet has prescribed chemical components, and the plating layer contains Zn. In a GDS measurement in the thickness direction of the plated steel sheet, the depth at which the light emission intensity Bx at a depth of x (µm) and the light emission intensity B150 at a depth of 150 µm satisfy Bx / B150≥5.0 is 0.5 µm or more from the interface between the steel sheet and the plating layer. The thickness of an oxide formed on the surface of the plating layer is 0.5 µm or less. An internal oxide layer having a thickness of 1.0 µm or more exists in the thickness direction of the steel sheet from the interface.

The invention provides a concrete admixture with sulfate corrosion resistance and rust resistance functions. The concrete admixture is prepared from the following raw materials in parts by weight: 50-65 parts of fly ash, 8-12 parts of barium carbonate, 8-12 parts of barium hydroxide, 8-12 parts of mineral powder, 5-8 parts of modified hydrotalcite or hydrotalcite, 1-3 parts of nano silicon dioxide and 1-3 parts of calcium nitrite. Nano silicon dioxide is adopted as a compact component, the porosity of the material is reduced, the compactness of concrete is improved, sulfate in the environment is inhibited from being transmitted into the concrete, meanwhile, hydrotalcite is modified by polymaleic acid serving as a scale inhibition component, and the scale inhibition effect is improved through the dual effects of high adsorbability and slow release of the scale inhibition component of hydrotalcite. The preparation method has the advantages that generation of ettringite and gypsum in a sulfate radical environment is inhibited, calcium nitrite is added as a corrosion-inhibiting component, a protective film is formed on the surface of a reinforcing steel bar, the corrosion phenomenon of the reinforcing steel bar in a concrete structure is inhibited, and finally, the concrete admixture with sulfate corrosion resistance and corrosion-inhibiting functions is formed through compounding.

The invention provides a method, a device and equipment for predicting corrosion current and corrosion of steel bars in concrete in a low-pressure environment, and belongs to the technical field of engineering simulation modeling. The method comprises the following steps: establishing a coupling transmission model in concrete considering oxygen concentration, sulfate ion diffusion behavior and chloride ion diffusion behavior; building a reinforcement corrosion current density and corrosion depth prediction model for predicting the number of charges at different positions of the reinforcement in the concrete, and calculating the corrosion depth and the corrosion product content based on the corrosion current density; and establishing a linear elastic damage model for simulating concrete damage evolution caused by steel bar corrosion according to the corrosion product content output by the steel bar corrosion current density prediction model so as to realize accurate prediction of corrosion and damage. According to the method, oxygen concentration changes under low air pressure are considered, oxygen diffusion is described, output of a transmission model serves as a dynamic variable to be introduced into the corrosion current calculation process, and the accuracy of corrosion current and steel bar corrosion prediction is improved.

The invention discloses a cyanide-free cadmium-iron alloy plating process for high-strength structural steel. The cyanide-free cadmium-iron alloy plating process comprises the step that a nickel-titanium alloy plating layer, a cyanide-free cadmium-iron alloy plating layer and a hexavalent chromium passivation film are sequentially prepared on a high-strength structural steel substrate from inside to outside. The prepared sample piece is subjected to a hydrogen brittleness test according to HB 5067.1-2005 Part 1 of hydrogen brittleness test of plating process: Mechanical Method, and the test result meets the standard requirement; the surface of a plated part is free of white rust after being subjected to an acetate mist test for 400h according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, and a plating layer of the plated part has excellent corrosion resistance; according to GB / T 5270-2005 < GB / T 5270-2005 < GB / T > 5270-2005 < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB /

A seamless flux-cored wire for 10CrNiCu steel for ships, applied to welding of continuous casting 907A steel for a main hull and composed of a low-carbon steel sheath and a flux core. The diameter of the wire is 1.0-1.4 mm; the filling rate of flux-cored powder is 14%-16%; measured as the mass percentage of the flux-cored wire, the flux core contains rutile, aluminum oxide, ferroboron, zircon sand, quartz, bismuth oxide, potassium titanate, sodium fluoride, electrolytic manganese, ferrotitanium, magnesium powder, manganese-silicon alloy, nickel powder, metal chromium, copper powder, and iron powder. The seamless flux-cored wire for 10CrNiCu steel for ships has the advantages of good welding performance, stable mechanical properties, good crack resistance, low diffusion hydrogen content, high moisture absorption resistance, excellent rust resistance, and the like. Also provided is a method for manufacturing the seamless flux-cored wire for 10CrNiCu steel for ships

The invention discloses a laser rust removal method based on machine learning. The method comprises the following steps: firstly, collecting rust removal experiment data of metals of different materials under different laser rust removal parameters, covering data such as metal surface images, corrosion degrees and matrix damage before and after rust removal, and preprocessing; secondly, features related to the rust removal effect and matrix damage are extracted, and key features are screened through a feature selection algorithm; and selecting a proper machine learning model, taking the key features as input, taking the derusting effect evaluation indexes as output training models, and adopting cross validation optimization. In the actual rust removal process, data collected by a sensor is combined with the model to conduct online monitoring and prediction, and parameters are dynamically adjusted through an optimization algorithm according to the result. And evaluating the effect after rust removal, comparing the actual and predicted results, and updating the model when the deviation is large. According to the method, the rust removal effect can be accurately controlled, the base body is protected, the efficiency is improved, self-optimization is achieved, and the method has wide application prospects.

The invention discloses a high-salt-corrosion-resistant concrete pouring material and a preparation method thereof, and relates to the technical field of high-salt-corrosion-resistant concrete, and the high-salt-corrosion-resistant concrete pouring material comprises the following components in parts by weight: 5-10 parts of modified charcoal, 1.5-3 parts of a corrosion inhibitor, 320-360 parts of cement, 650-700 parts of river sand, 20-30 parts of silica fume, 0.3-0.6 part of super absorbent resin, and 0.2-0.8 part of a water reducing agent. According to the high-salt-corrosion-resistant concrete pouring material and the preparation method thereof, a protective film is formed on the surface of a reinforcing steel bar through the corrosion inhibitor, the anodic oxidation reaction is inhibited, the reinforcing steel bar is prevented from being corroded, eugenol releases corrosion inhibition molecules, a hydrophobic protective film is formed on the surface of the reinforcing steel bar, and electrochemical corrosion is inhibited; meanwhile, through the synergistic effect of a physical barrier and chemical passivation, the calcium-aluminum salt-eugenol composite corrosion inhibitor not only can block a corrosion path through physical film formation, but also can inhibit electrochemical reaction through chemical adsorption, so that the corrosion inhibition efficiency is improved.

The invention belongs to the technical field of manufacturing of low-alloy high-strength steel, and particularly relates to atmospheric corrosion resistant HC260LA low-alloy high-strength steel and a production method of the atmospheric corrosion resistant HC260LA low-alloy high-strength steel. 0.15% to 0.30% of Si; 0.40% to 0.60% of Mn; 0.06% to 0.10% of P; less than or equal to 0.015% of S; 0.02% to 0.08% of Al; 0.10% to 0.20% of Cu; 0 to 0.15% of Ti; 0 to 0.09 percent of Nb; 0.001% to 0.006% of N; and the balance of Fe and inevitable impurities. According to the method, the blocking effect of segregation of P-Cu elements on the grain boundary on a corrosion path is utilized, low-temperature rolling is combined, a three-dimensional corrosion-resistant system of fine grain strengthening, substructure strengthening and rust layer protection is constructed, and the weather resistance, the corrosion resistance and the mechanical property are jointly improved.

The invention discloses a chromium-free fingerprint-resistant coating agent for a galvanized steel sheet and a preparation method of the chromium-free fingerprint-resistant coating agent. The chromium-free fingerprint-resistant coating agent is prepared from the following elements in percentage by mass: 1%-5% of sodium molybdate or / and sodium tungstate, 0.5%-2% of a phytic acid-chitosan compound, 0.3%-1.0% of a chelating titanate coupling agent, 2%-5% of fluorosilane modified nano SiO2, 30%-55% of waterborne hyperbranched polyurethane resin, 0.5%-2% of oxidized polyethlene wax and the balance of deionized water. The chromium-free fingerprint-resistant coating agent disclosed by the invention has excellent fingerprint resistance, high adhesive force and environmental protection property, is free of white rust in neutral salt mist for 150 hours and red rust in neutral salt mist for 360 hours, the white rust area is less than 5%, the industrial requirements of galvanized steel sheet surface treatment are met, and the problem of environmental risk in the prior art is avoided by adopting the combination of bio-based corrosion inhibitors.

The invention discloses an expansion sleeve with low expansion pressure and high external extrusion resistance after expansion. The expansion sleeve comprises chemical components in percentage by weight as follows: 0.04%-0.25% of C, 0.1%-1.0% of Si, 0.5%-1.8% of Mn, 0.02%-0.10% of Nb and Plt. Slt, 150 ppm, Slt; 80 ppm, with the balance being Fe and unavoidable impurities. The production method comprises the following steps: smelting and continuously casting molten steel to obtain a proper casting blank; a pipe blank is produced through hot rolling, and it is ensured that the proper size and a good-plasticity organization structure are achieved; pretreating the hot-rolled pipe blank, wherein the pretreatment comprises acid pickling, cleaning, neutralizing, phosphating and saponifying; cold rolling is conducted to achieve the needed size specification, and high size precision is achieved; heat treatment is carried out, and methods such as annealing or hardening and tempering can be selected to optimize the material performance; and the inner surface is subjected to sand blasting or polishing treatment, and anti-rust measures are taken.

The invention belongs to the technical field of insulation treatment of magnetic materials, and provides a preparation method of an oxidation-resistant high-resistivity soft magnetic composite material, which comprises the following steps: mixing an antioxidant metal organic framework (Cu-MOFs) with nano oxide and resin according to a certain proportion, and treating iron-based alloy powder. On one hand, the Cu-MOFs material is adsorbed on the surface of the magnetic powder to form a compact protective film to inhibit oxidation of a metal matrix, and on the other hand, the Cu-MOFs material has good compatibility with resin and is uniformly dispersed in a coating system, so that the permeation path of an oxidizing medium is effectively reduced, and the service life of the coating is prolonged. And rich functional groups of the Cu-MOFs material can change the surface characteristics of the nano oxide, the agglomeration effect of the nano oxide is reduced, the resistivity of the magnetic powder core is improved, and meanwhile the problem that the iron-based alloy magnetic powder core is oxidized and rusted in a special environment is effectively solved.

The invention discloses a preparation method for laser cladding of an iron-based alloy wear-resistant coating on the surface of an automobile brake disc, which comprises the following steps: (1) before cladding, putting iron-based alloy powder into a drying oven at 60 DEG C and drying for 120 minutes; (2) pretreating a matrix sample, removing rust and an oxide layer on the surface, cleaning the surface with absolute ethyl alcohol, and wiping to keep the surface dry; and (3) setting cladding process parameters, wherein the cladding process parameters comprise laser power, powder feeding amount, scanning speed, lap joint rate and scanning linear speed. And (4) a cladding experiment is started, and a cladding scanning path and mode are set, wherein the cladding scanning path and mode comprise a single-channel coating, a multi-channel lap joint coating and a whole-surface brake disc. And (5) after cladding is finished, waiting for natural cooling of the brake disc. The iron-based powder is used for preparing the coating on the surface of the automobile brake disc, technological parameters are optimized, the cladding procedure is simplified, the powder cost is low, the prepared coating is good in performance, and a single-layer coating scheme is provided for strengthening and repairing the brake disc.

The invention discloses a quick-dry salt-spray-resistant industrial water-based paint and a preparation method thereof, and relates to the technical field of paints. Cerium zirconium oxide is used for preparing nanofiber filler, cellulose is added into a precursor of the nanofiber filler, a carbon substance is obtained through calcination, then the mechanical property of the filler is enhanced, and an interpenetrating network structure with cerium oxide-zirconium oxide particles as nodes is formed in a hybrid material, so that the mechanical property of the coating is enhanced; then the ionic liquid is adsorbed on the carbon substance, then the nano filler is effectively modified, the mechanical property and corrosion resistance of the filler are improved, cerium oxide can inhibit the metal corrosion process, and in the later stage of corrosion prevention operation, cerium oxide and iron oxyhydroxide form a compact and stable surface rust layer structure, the corrosion rate is effectively decreased, and the corrosion resistance of the nano filler is improved. Zirconium oxide can greatly eliminate local micro-current corrosion of carbon substances and metal, and the corrosion resistance of the coating is further enhanced.

The invention relates to a metal passivator, and particularly discloses an environment-friendly passivation solution for a metal component and a preparation method and a passivation process of the environment-friendly passivation solution. The passivation solution comprises 1%-5% of trivalent chromium salt, 1%-5% of silicon-containing compound modified alkyd resin, 2%-15% of a film forming accelerant, 5%-15% of a complexing agent, 1.5%-2% of a hole sealing agent and the balance deionized water. The low-content trivalent chromium salt is adopted to replace traditional hexavalent chromium salt, the toxicity of trivalent chromium is far lower than that of hexavalent chromium, heavy metal pollution hazards are effectively reduced, and by adding assistants such as the silicon-containing compound modified alkyd resin, the hole sealing agent, the film forming accelerant and the complexing agent, through the synergistic effect of all the components, the corrosion resistance of the coating is improved, and the service life of the coating is prolonged. A compact, uniform and stable passivation film is formed on the surface of the sherardizing steel part, the probability of rusting and corrosion of the sherardizing steel part is remarkably reduced, the service life of the sherardizing steel part in severe environments such as high humidity and high salinity is prolonged, and high practical value is achieved.

The utility model discloses a metal product surface oxide layer derusting device which comprises a pickling tank, two sets of supporting legs are welded and fixed to the two sides of the bottom of the pickling tank, an emptying pipe is fixedly installed on the right side wall of the pickling tank, and meanwhile the upper portion of the emptying pipe is fixedly connected with a fixing plate through two sets of bolts. The top of the fixing plate is fixedly welded to the adjusting base, a locking piece is fixedly arranged above the adjusting base, and a positioning area is formed in the locking piece. And a metal product placing frame is arranged in the pickling tank. According to the rust removal device for the oxide layer on the surface of the metal product, the positioning strip penetrates through the containing opening to be clamped in the containing opening, the metal product containing frame is submerged in acid pickling rust removal liquid contained in the acid pickling tank, rust removal work is completed, in the whole rust removal work process, the hands cannot make contact with the acid pickling rust removal liquid, the hands are protected, and the rust removal efficiency is improved. And meanwhile, rapid acid pickling and rust removing work on the metal parts is completed.

The invention discloses a surface corrosion-resistant invar alloy precision strip for a liquid cargo cabin of a liquefied natural gas carrier and a manufacturing method. The surface corrosion-resistant invar alloy precision strip comprises the following components: 35.6%-37.1% of Ni, 0.35%-0.80% of Si, 0.05%-0.10% of Ce, 0.015%-0.030% of C, less than or equal to 0.35% of Mn, 0-0.0008% of O, less than or equal to 0.01% of N, less than or equal to 0.003% of S, less than or equal to 0.005% of P, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Cu, less than or equal to 0.05% of Al, less than or equal to 0.003% of Ti and the balance of iron and inevitable impurity elements. According to the formula, through EAF, AOD, LF, continuous casting or die casting, hot continuous rolling or solid solution pickling after forging, cold rolling in multiple rolling processes, annealing and protective film prefabrication treatment, the temperature range of the prepared material is about 1.5-1.8 * 10 <-6 > / DEG C from-163 DEG C to 20 DEG C, the yield strength Rp0.2 value is larger than or equal to 300 MPa, the tensile strength Rm value is larger than or equal to 480 MPa, the ductility A50 is larger than or equal to 35%, surface corrosion does not occur within the machining period or storage and transportation time of 15 days under the conventional condition, and the service life of the material is prolonged. And particularly, the risk of surface rusting in the processing, storage and transportation processes is greatly reduced.

The invention discloses a lubricating process of a surface treatment process of a corrosion-resistant steel member, which comprises the following steps: S1, rust removal: carrying out first rust removal on the steel member by adopting a chemical mode, and then carrying out second rust removal on the steel member by adopting a mechanical mode; s2, oil removal: removing non-saponified oil stains by using an organic solvent, and removing saponified animal and vegetable oil by using an alkaline solvent; s3, phosphate is adopted for phosphating treatment, and a microporous structure layer is formed; s4, spraying is conducted on the steel component, and a metal coating is formed; s5, spraying an organic sealing layer on the metal coating; s6, drying: drying by adopting a dryer or a natural air-drying mode; and S7, sealing pores by using a silane impregnant to form a hydrophobic protection layer. Compared with the prior art, the problems that the protection effect is poor, severe environments cannot be handled and the service life is short due to the fact that anti-corrosion paint is mostly coated on the surfaces of the steel components for protection in existing steel component anti-corrosion treatment can be solved.

The invention discloses a metal bent pipe cutting technology which comprises the steps of surface rust removal of the surface of a cutting raw material, fixing of the metal cutting raw material, simultaneous cutting of the two ends and waste treatment. The top of the mounting base is connected with a clamping angle adjusting assembly, one side of the clamping angle adjusting assembly is connected with a synchronous cutting assembly for cutting from the two ends of a metal bent pipe at the same time, the angle position of the clamping angle adjusting assembly is adjusted according to the radian of a metal pipe, and the metal bent pipe can be cut through the synchronous cutting assembly; the two ends of the metal pipe fitting are synchronously cut, the situation that the two ends of the metal pipe fitting are cut twice is reduced, the risk of scalding in the cutting process is avoided, and meanwhile in the process that the two ends are cut at the same time, the risk that cutting scraps adhere to the inner wall in the cutting process of the two ends is reduced.

The invention discloses a highly efficient heat-conductive new energy vehicle coolant and a preparation method thereof, wherein the components include a base liquid having a mass volume ratio of 500-1000 mL: 2-10 mL: 0.03-0.5 g: 5-10 g: 5-10 g: 0.02-0.1 g: 1-10 g, a suspension of silane-modified nano-alumina having a mass concentration of 1-5%, a defoamer, a corrosion inhibitor, a rust inhibitor, a scale inhibitor and an inhibitory additive, and the pH of the coolant is regulated to 7.5-8.5 by an alkali metal hydroxide. The formula system of the coolant of the present invention achieves the advantages of high thermal conductivity and good metal corrosion resistance based on the synergistic effect of each component, and can be used in the fields of new energy vehicles, energy storage power stations, etc. Therefore, it has a good prospect for application and promotion.

The invention relates to the technical field of flux-cored wires, and discloses a high-rust-resistance flux-cored wire preparation method which comprises the following steps of S1, raw material pretreatment, S2, powder adding and forming, S3, surface modification and S4, finished product inspection. Before work is started, a worker prepares raw materials including high-carbon ferrochrome, tungsten carbide, boron carbide, rare-earth metal oxide and ferromolybdenum powder, then grinding equipment is used for grinding the raw materials, then the ground powder is dried for 2-3 hours through equipment at the temperature of 100-150 DEG C, the dryness of the raw materials is guaranteed, and the raw materials are evenly mixed. The method comprises the following steps: firstly, preparing a flux-cored wire, then uniformly stirring by utilizing three-dimensional mixing equipment, and then mixing and proportioning according to different proportions according to a corrosion-resistant flux-cored wire, an acid-base-resistant flux-cored wire and a high-hardness high-temperature-resistant flux-cored wire, so that the welding wires with corresponding properties can be conveniently used according to different environments, and the maximization of the functionality of the welding wire is improved.

The invention provides a low-carbon environment-friendly rust-proof treated cast iron machine body blank and a rust-proof process thereof, and relates to the technical field of rust-proof treatment. The thickness of an oxidation film in the cast iron machine body blank subjected to low-carbon environment-friendly rust-proof treatment is 5-25 microns, the porosity of the oxidation film is not higher than 15%, and the binding force of the oxidation film is not lower than 5 Mpa. According to the low-carbon environment-friendly cast iron body blank obtained through the rust prevention process, a compact oxidation layer is generated on the surface and the inner hole wall of the cast iron piece, and then the corrosion resistance of the cast iron piece is improved. And moreover, the problem that the engine body is rusted during circulation processing in a factory can be solved without spraying paint on the outer surface of the engine body, so that the energy consumption is greatly reduced, the low-carbon and environment-friendly effects are realized, the production efficiency is improved, and the manufacturing cost is reduced.

The invention relates to the technical field of shot blasting machines, in particular to a shot blasting machine with multiple layers of sealing devices at the top, which comprises a shot blasting machine body, multiple layers of top shells are fixedly mounted at the bottom of the shot blasting machine body, a conveyor is fixedly mounted at the bottom of the multiple layers of top shells, and the shot blasting machine further comprises a supporting mechanism, a vibrating mechanism and a scraping mechanism; the driving motor and the dust collection motor are started to operate, the dust collection motor generates suction force on air in the top cover and the expansion shell, when rust ash is generated by shot blasting, the suction force can suck the rust ash to the inner side of the expansion shell, the driving motor drives the auger frame to rotate, and the auger frame drives steel shots, the rust ash and other impurities to conduct conveying work; in the conveying process, rust ash and small impurities are screened out through the filtering shell, and therefore the rust ash generated by shot blasting can be cleaned.

The invention discloses a pulse copper plating process with low TOC and high deep plating capacity. The pulse copper plating process comprises the following steps that 1, pretreatment is conducted, specifically, a substrate is subjected to cleaning, oil removing and acid etching rust removing treatment; 2, surface treatment: treating the surface of the substrate by using a treating agent; thirdly, acid copper sulfate copper plating is conducted, specifically, the treated substrate is placed in a copper plating tank, and electroplating is conducted through a copper electroplating solution of high-purity copper sulfate with the purity being 99.8%; 4, post-treatment is conducted, specifically, the copper-plated substrate is cleaned and dried; step 5, inspection: performing external inspection and performance inspection on the dried substrate; by adding the electroplating liquid, reducing the bath changing frequency and reducing the sewage treatment capacity, the production cost is reduced, the pollution to the environment is greatly reduced, and the production cost of an enterprise is reduced; tOC is low under the same load condition, the cylinder changing frequency is reduced, and wastewater discharge is reduced; meanwhile, due to low TOC, the service life of the additive can be doubled, and the production cost is reduced.

The invention discloses a valve body workpiece composite deburring method which comprises the steps that an AGV transfer trolley transfers a valve body workpiece to a rough cleaning machine, and scrap iron and cutting fluid on the surface and an inner cavity of the valve body workpiece are flushed and removed through cleaning fluid in the rough cleaning machine; after rough cleaning, the valve body workpiece is transferred to a deburring workbench for manual deburring; the valve body workpiece subjected to manual deburring is transferred to an endoscopic table, and scrap iron in an inner cavity of the valve body workpiece is inspected and removed through an endoscope; the valve body workpiece subjected to endoscopy enters a high-pressure cleaning machine through the roller way for high-pressure cleaning; the valve body workpiece subjected to high-pressure cleaning enters a heat energy explosion automatic roller line, is overturned by an overturning tool and then is fed into a heat energy explosion machine through a mechanical arm, and burrs are changed into metal oxidation powder through heat energy explosion combustion; and the valve body workpiece subjected to heat energy explosion combustion enters a derusting cleaning machine, and metal oxidation powder is removed through acid pickling. Mechanical deburring, high-pressure deburring and heat energy deburring are integrated, and the quality of a valve body workpiece is improved.

The invention discloses a coating-free ultrahigh-pressure compressed air storage tank. The coating-free ultrahigh-pressure compressed air storage tank comprises a vertical storage tank, the vertical storage tank is manufactured by adopting a welding pipe, and the welding pipe comprises the following chemical elements in percentage by mass: 0.015 to 0.15 percent of C, 0.1 to 0.5 percent of Si, 1.40 to 2.20 percent of Mn, 0.03 to 0.10 percent of Nb, 0.01 to 0.035 percent of Ti, 1 to 9 percent of Cr, 0.001 to 0.005 percent of Ca, 0.02 to 0.045 percent of Al, 0.20 to 0.50 percent of Cu + Ni and the balance of Fe and inevitable impurities. The surface of the welded pipe is provided with a stable rust layer. The invention further discloses a manufacturing method of the compressed air storage tank. The manufacturing method comprises the steps that the welded pipe is manufactured; performing surface rust layer stabilizing treatment on the welded pipe to obtain a stable rust layer; a vertical storage tank is manufactured based on the welded pipe.

The invention provides a preparation process of an anti-corrosion coating matched with the outer surface of a large oil storage tank, and the anti-corrosion coating matched with the outer surface is composed of a high-solid epoxy zinc-rich primer, a high-solid epoxy micaceous iron oxide intermediate paint and a high-solid polyurethane finish paint. The anti-corrosion coating matched with the outer surface of the large oil storage tank has the advantages of being high in adhesive force, good in water resistance, good in chemical resistance, excellent in weather resistance and the like, has remarkable economic benefits and social benefits, and has wide application prospects in the field of oil storage tank protection. The problems that according to the outer surface corrosion problem of an existing oil storage tank, a bottom coating is difficult to construct and poor in rust prevention, a middle coating is poor in flexibility and seepage resistance, and a surface coating is low in adhesive force, weather resistance and water resistance, so that the protection function of the storage tank is prone to losing efficacy are solved.

The utility model provides a reinforcing steel bar straightening device which comprises a straightening machine, two ends of the straightening machine are respectively provided with an inlet and an outlet for a reinforcing steel bar body to enter and exit; the rust removal unit comprises a mounting cylinder mounted at the outlet end of the straightening machine and a rotating cylinder rotationally arranged in the mounting cylinder, and a polishing piece is detachably arranged in the rotating cylinder and used for polishing the steel bar body; the driving unit is arranged on the straightening machine and is in transmission connection with the rotating cylinder, and the driving unit is used for driving the rotating cylinder to rotate; the collecting unit is arranged at the bottom of the straightening machine and used for collecting iron rust powder; according to the steel bar straightening machine, the rust removal unit is arranged on the straightening machine, a steel bar to be straightened enters the straightening machine from the inlet of the straightening machine to be straightened, then penetrates out of the outlet end and penetrates through the rotating grinding piece in the rust removal unit, the grinding piece rotates to grind and remove rust on the straightened steel bar, and therefore rust can be removed in the steel bar straightening process at the same time; the problem that the strength and durability of the steel bars are reduced due to the fact that rust treatment on the surfaces of the steel bars is neglected during straightening is solved.

The present invention discloses an indoor quantitative calibration device and method for the corrosion rate of steel bars under stress. The device comprises: a loading device and a testing device; the loading device comprises a loading frame, a first nut, a first disc spring, a second nut and a second disc spring; the testing device comprises a signal reader, a water tank and an inclined bracket, a water tank water inlet and a water tank drain arranged inside the water tank; the signal reader is used to connect a steel wire of the same material as the steel bar to be tested. The method comprises: S1, installing the device; S2, injecting a calcium hydroxide solution containing sodium chloride into the water tank through the water inlet; S3, accelerating the corrosion of the steel bar and steel wire to be tested; S4, calibrating the steel bar corrosion rate using the change in frequency before and after the steel wire is rusted. The method of the present invention fully considers the influencing factors such as the charge transfer resistance of the interface between the steel wire and the concrete, the concrete resistance and the film resistance of the steel wire passivation film to improve the test accuracy.

The utility model discloses a steel bar derusting device, which relates to the technical field of derusting, and comprises a derusting box, an inlet and an outlet which are arranged on the side surface of the derusting box, a nozzle which is arranged at the top end of the derusting box and is used for spraying derusting sand into the derusting box, and a grating plate which is arranged in the derusting box and is positioned between the inlet and the outlet, the dust collection mechanism is arranged on the side face of the rust removal box, and the traction mechanism drives the steel bars to enter the rust removal box from the inlet and then penetrate out of the rust removal box from the outlet. The dust collection mechanism is arranged on the rust removal box, rust removal sand sprayed by the nozzle is in the rust removal box, negative pressure is generated by the dust collection mechanism, dust is prevented from overflowing from the inlet and the outlet, and meanwhile the dust removal cloth bag can recycle the rust removal sand for reuse. A traction steel bar can enter the rust removal box from the inlet and penetrate out of the outlet after being subjected to rust removal, the process is convenient and rapid, and operation is easy.